package org.h2.index;
import org.h2.command.dml.AllColumnsForPlan;
import org.h2.engine.Session;
import org.h2.message.DbException;
import org.h2.result.Row;
import org.h2.result.SearchRow;
import org.h2.result.SortOrder;
import org.h2.table.IndexColumn;
import org.h2.table.RangeTable;
import org.h2.table.TableFilter;
public class RangeIndex extends BaseIndex {
private final RangeTable rangeTable;
public RangeIndex(RangeTable table, IndexColumn[] columns) {
super(table, 0, "RANGE_INDEX", columns,
IndexType.createNonUnique(true));
this.rangeTable = table;
}
@Override
public void close(Session session) {
}
@Override
public void add(Session session, Row row) {
throw DbException.getUnsupportedException("SYSTEM_RANGE");
}
@Override
public void remove(Session session, Row row) {
throw DbException.getUnsupportedException("SYSTEM_RANGE");
}
@Override
public Cursor find(Session session, SearchRow first, SearchRow last) {
long min = rangeTable.getMin(session);
long max = rangeTable.getMax(session);
long step = rangeTable.getStep(session);
if (first != null) {
try {
long v = first.getValue(0).getLong();
if (step > 0) {
if (v > min) {
min += (v - min + step - 1) / step * step;
}
} else if (v > max) {
max = v;
}
} catch (DbException e) {
}
}
if (last != null) {
try {
long v = last.getValue(0).getLong();
if (step > 0) {
if (v < max) {
max = v;
}
} else if (v < min) {
min -= (min - v - step - 1) / step * step;
}
} catch (DbException e) {
}
}
return new RangeCursor(session, min, max, step);
}
@Override
public double getCost(Session session, int[] masks,
TableFilter[] filters, int filter, SortOrder sortOrder,
AllColumnsForPlan allColumnsSet) {
return 1;
}
@Override
public String getCreateSQL() {
return null;
}
@Override
public void remove(Session session) {
throw DbException.getUnsupportedException("SYSTEM_RANGE");
}
@Override
public void truncate(Session session) {
throw DbException.getUnsupportedException("SYSTEM_RANGE");
}
@Override
public boolean needRebuild() {
return false;
}
@Override
public void checkRename() {
throw DbException.getUnsupportedException("SYSTEM_RANGE");
}
@Override
public boolean canGetFirstOrLast() {
return true;
}
@Override
public Cursor findFirstOrLast(Session session, boolean first) {
long pos = first ? rangeTable.getMin(session) : rangeTable.getMax(session);
return new RangeCursor(session, pos, pos);
}
@Override
public long getRowCount(Session session) {
return rangeTable.getRowCount(session);
}
@Override
public long getRowCountApproximation() {
return rangeTable.getRowCountApproximation();
}
@Override
public long getDiskSpaceUsed() {
return 0;
}
}